Put hot buttons at the top of your browser window with ActiveCaption, a free add-on from OneSeek that's available on PC World's April editorial CD (on sale now!).
You can program the buttons with favourite URLs, or type keywords into the caption bar to search the Web. And ActiveCaption's Bookmark Manager is transportable between IE and Navigator.
If you use both browsers, ActiveCaption will pop up at the top of both, and you can access your Bookmarks/Favorites with either browser. It works with versions 3.x or later of Navigator and IE.